Merge pull request #2227 from nginx-proxy/dependabot/github_actions/actions/setup-python-4

ci: bump actions/setup-python from 2 to 4

.github/workflows/test.yml

@@ -26,7 +26,7 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Set up Python 3.9
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: 3.9